Returns the backend's probe, reusing a cached result while its CLI, configuration and selected environment stamps are unchanged and it is younger than the five-minute TTL. Concurrent misses share one probe; a failed probe is not cached.
Backend to probe.
fresh always probes and replaces the cached result (doctor); context supplies read budget/signal.
fresh
context
Returns the backend's probe, reusing a cached result while its CLI, configuration and selected environment stamps are unchanged and it is younger than the five-minute TTL. Concurrent misses share one probe; a failed probe is not cached.